Health Literacy, Rational Drug Use, and Cyberchondria in Rheumatic Diseases

Purpose: This study aimed to evaluate rational drug use (RDU), health literacy (HL), and cyberchondria levels among individuals diagnosed with inflammatory rheumatic diseases, and to investigate the factors associated with these three key health-related variables. Methods: This research was designed as a cross-sectional study and conducted between December 2024 and May 2025. The study enrolled three cohorts: a case cohort comprising patients diagnosed with rheumatic disease as patient group (group 1); a disease control cohort of knee osteoarthritis (group 2), and a reference control cohort of age- and sex-matched healthy participants (group 3). Disease Activity Score 28 (DAS28) was administered to patients with rheumatoid arthritis; Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) was administered to patients with ankylosing spondylitis; Psoriatic Arthritis Disease Activity Index (DAPSA) was administered to patients with psoriatic arthritis; Western Ontario and McMaster University Osteoarthritis Index (WOMAC) was administered to patients with knee osteoarthritis; and Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), Turkey Health Literacy Scale-32 (THLS-32), Rational Drug Use Scale (RDUS), and Cyberchondria Severity Scale (CSS) were administered to all participants. Results: The study sample consisted of 228 participants, with 76 individuals assigned to each of the three groups. Mean age, and gender distribution were similar in all three groups. Statistically significant variations were observed across the three groups regarding THLS-32, RDUS, and CSS scores (p \< 0.001). Group 1 had the highest HL and RDUS scores, and moderate CSS scores. In contrast, Group 2 showed the lowest HL and RDUS scores, while Group 3 demonstrated the highest CSS scores. HL was positively correlated with RDU (r = 0.552, p \< 0.001), and moderately negatively correlated with cyberchondria (r = -0.448, p \< 0.001). These results indicate that higher HL is associated